부산대학교 도서관

Objective:Bioactive food ingredients influence energy balance by exerting weak thermogenic effects. We studied whether the thermogenic effect of a combination of capsaicin, green tea extract (catechins and caffeine), tyrosine, and calcium was maintained after 7-day treatment and whether local effects in the gastric mucosa were involved in the efficacy.Design:The present study was designed as a 3-way crossover, randomised, placebo-controlled, double-blinded intervention.Setting:Department of Human Nutrition, RVAU, Denmark.Subjects:A total of 19 overweight to obese men (BMI: 28.0±2.7 kg/m2) were recruited by advertising locally.Intervention:The subjects took the supplements for a period of 7 days. The supplements were administrated as a simple supplement with the bioactive ingredients, a similar enterocoated version, or placebo. In all, 24-h energy expenditure (EE), substrate oxidations, spontaneous physical activity (SPA), and heart rate were measured in respiration chambers on the seventh day of each test period.Results:After adjustment for changes in body weight and SPA, 24-h EE was increased by 160 kJ/day (95% CI: 15–305) by the simple preparation as compared to placebo, whereas the enterocoated preparation had no such effect (53 kJ/day,−92 to 198); simple vs enterocoated versions (P=0.09). The simple preparation produced a deficit in 24-h energy balance of 193 kJ/day (49–338, P=0.03). Fat and carbohydrate oxidation were equally increased by the supplements.Conclusion:A supplement containing bioactive food ingredients increased daily EE by∼200 kJ or 2%, without raising the heart rate or any observed adverse effects. The lack of effect of the enterocoated preparation suggests that a local action of capsaicin in the gastric mucosa is a prerequisite for exerting the thermogenic effect.Sponsorship:Supported by Science, Toxicology& Technology, San Francisco, CA, USA.European Journal of Clinical Nutrition (2005) 59, 733–741. doi:10.1038/sj.ejcn.1602121 Published online 4 May 2005 [ABSTRACT FROM AUTHOR]